Java Javadoc include Private

Have you looked at the man-page?

https://docs.oracle.com/javase/1.5.0/docs/tooldocs/solaris/javadoc.html

It contains a section of simple examples.

Try this for instance

javadoc -private -d /home/html -sourcepath /home/src

From the command line, it says

javadoc [options] [packagenames] [sourcefiles] [@files]

So it would be something like:

javadoc -private -d output/directory -sourcepath src/java

But you may also take a look to the javadoc documentation and this section.